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Restructuring and Excess Facilities - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2008 Sunnyvale building [Member] | Dec. 31, 2008 Buildings in United Kingdom [Member] | Dec. 31, 2008 Selling, general and administrative expenses [Member] Sunnyvale building [Member] | Dec. 31, 2008 Selling, general and administrative expenses [Member] Buildings in United Kingdom [Member] | Mar. 31, 2011 Excess Facilities [Member] | Dec. 31, 2010 Excess Facilities [Member] | Dec. 31, 2012 Excess Facilities [Member] | Dec. 31, 2011 Excess Facilities [Member] | Dec. 31, 2010 Excess Facilities [Member] | Dec. 31, 2010 Scopus Facilities [Member] | Dec. 31, 2009 Scopus Facilities [Member] | Dec. 31, 2009 Scopus Facilities [Member] Cost of revenue [Member] | Dec. 31, 2009 Scopus Facilities [Member] Severance and other expenses [Member] | Dec. 31, 2009 Scopus Facilities [Member] Provisions for excess and obsolete inventories [Member]
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected sublease income |  |  |  |  |  | $ 1,200,000 | $ 200,000 |  |  |  |  |  |  |  |  |  |
Lease terminated |  |  |  | 2010-09 | 2010-10 |  |  |  |  |  |  |  |  |  |  |  |
Excess facilities expense | (94,000) | (517,000) | (2,991,000) |  |  |  |  | 517,000 | 3,061,000 | (94,000) | (517,000) | (3,061,000) | (3,000) | 8,300,000 | 6,300,000 | 500,000 | 5,800,000
Severance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 + Details
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